All genetics are only expressible in an environment. What's more, metabolic functions are pretty nuts and bolts stuff that don't usually have huge variances. So I'm not sure what you think is so biologically determined.Genetics will play the largest factor. Scientists don't like saying this too often because it carries cultural implications but it is what it is. We are biological beings, there's no getting around it.
Also I find the first 3-4 paragraphs of this article not really science at all, rather anecdotal opinion based off junk science that produces inconsistent evidence. I.e. the calories in:calories out arguement. The hypothesis that you can consume a bowl of ice cream ridden in tons of sugar, high-fructose genetically modified corn syrup, and preservatives as oppsed to organic chicken breast within the same caloric intake value and the result is negligible is not reputable science you should give any mind too. As soon as you introduce the pancreas and liver into the equation this in-out argument becomes extremely silly and misinformed.
It's important to remember that in the scientific method, hypothesis is not evidence, and evidence is not proof. When researching studies, aways look at which body is conducting the study, what is the sample size and what are the controls. Was it peer-reviewed independently by a reputable source. You can pretty much toss out studies conducted internally by manufacturers and always get a second opinion on anything FDA regulators pass. The current American nutrition pyramid is basically upside down. A real boon to those industries that rank low on the pyramid.
No mention of thyroid conditions eh?
I spent forty years wondering why I could only maintain my weight if I ate no more than 800 calories per day whilst my friends could eat whatever they liked without a problem. Fast forward to when I reached the age of 45 and finally got a diagnosis that explained the weight gain, the extreme fatigue, the brain fog and the joint aches and pains I'd always suffered from - seems my immune system, back when I was 9 years old, decided I didn't need a thyroid gland and destroyed it. Since I got my diagnosis I've had access to a tiny pill once a day which provides the thryoxine hormone I lacked, I've found my weight has been dropping, plus all my other health problems have resolved. So yeah, I agree, everybody is different, and fat people are not necessarily "lazy" or unmotivated. Some of us have a medical condition that means we really can't control our weight. I wish the doctors hadn't just brushed off my various complaints over the years, had taken a blood test and found out that I had no thryoid. It would have saved me such a lot of grief.No mention of thyroid conditions eh?
I was just like you for decades, and even after I became disabled, I didn't gain weight, simply lost muscle mass. The only difference was that I don't add salt to much of anything. The rest, though, could have made us twins.I am one of those people! Actually had my annual physical today and discussed this with my doctor. I try very hard to gain weight, but find it very difficult. I will often make month long efforts to do so, but achieve little results. I can spend an entire month, every single day, eating 6,000 to 8,000 calories per day. After 30 days, I will gain 2-3 pounds (1.5-2% gain of body weight). It is actually quite difficult for me to consume this much food in any given day! It takes a real conscious effort to eat this much, IMO. According to my Dr., my body mass index is "perfect" at 22% and he says, as such, I should be somewhat careful in such efforts as I am at the ideal point. So, I conclude that it is hereditary combined with certain habits (that are not necessarily good). There are three things that I do: I drink a fair amount of coffee (4-5 cups per day, with cream and sugar), I drink the equivalent of 4-5 cans (12 ou) of Coke per day (when I was younger I drank between 12-24 cans of Coke per day), I smoke! The coffee and Coke both speed up my metabolism (sugar & caffeine), smoking suppresses my appetite (but for me, drives my thirst or desire to consume beverages). I can't say whether there is a gene, a life style, or what. In my 30s, people told me it would change when I hit my 40s. In my 40s they told me it would change when I hit 50. I am now half way through my 50s . . . Obviously, I am thinner than I would like to be. Things that I don't do: drink much alcohol, snack, eat very many processed foods. I love red meat, bacon, BBQ, good cheeses, fatty foods, salt, but I don't like candy very much. I get a moderate amount of exercise. I am only 5'8" tall, a male. If I eat less than 2,500 calories in a day, I lose weight. Ideally, if I eat 3,000-4,500 calories per day, I neither gain or lose weight. I go to the bathroom 2-3 times per day and urinate 12-15 times per day. I try to eat every night right before I go to bed - usually this is the equivalent of two bowls of sweetened cereal with 1.5-2 cups of whole milk. I don't eat breakfast (except when I am making month long efforts to gain weight)! I sometimes worry that this sets my body up to conserve or change in a way that may contribute to my problem - but I find I'd rather have a couple of cups of coffee and smoke than take the time to eat breakfast before work. Overall, I am one of those people that eats and believes in a balanced, highly diverse diet. I eat fruit and vegetables everyday, but also eat meat every day. I don't believe in or get into taking all sorts of supplements - as I think they are a waste for people that eat diverse, well balanced diets. I also have seen how using supplements as an alternative to eating a balanced diet causes unintended harm and consequences to our bodies. I feed my body whatever it is that it is craving! I believe my body's cravings are a way for my body to tell me what it needs from a nutritional perspective. I will find if I am traveling for several days for work (which means eating at restaurants for every meal), that after a few days I will be craving a big salad, or fruit, or something (which may be less prevalent in your typical restaurant meals).
Overall, things that I consume a lot of, a disproportionate amount of (as a % of my intake):
Salt that I add myself to food (but I suspect it is FAR less than I would consume if eating processed foods)
Meat, red meat in particular
Olive Oil - we go through a LOT of olive oil
Sweetened cereals (captain crunch, cocoa pebbles, frosted flakes, apple jacks)
Coke (no, there is NO substitute, other than RC when I am in the mood for it)
Butter - my wife always asks why I add butter to nearly every dish I am preparing - because it makes nearly everything in the world taste better!
None of this is to say that I think I am good or lucky or anything of the sort. I know I have some bad habits and am intelligent enough to know I should change them (drinking too much soda and smoking) - but I simply have chosen not to - I am not a victim to anybody but my own choices in this regard. Though I did promise my Doctor that by next year's physical, I will have quit smoking. He replied that more people die every year from from being overweight and the problems it causes (especially the accumulation of fat around our organs - which roughly 20% of very overweight/obese people suffer from).
Because I have such a tough time keeping weight on or gaining weight, I think it has given me a better understanding or appreciation for people who have the opposite problem (obesity/weight gain).
I sometimes wonder if I should have my intestines and/or stomach tested for enzymes/bacteria types and the such to determine if this contributes to my scenario.
I'm afraid I have to take issue with this - when I was unaware that I had no thyroid, my resting heart rate was at 30 bpm. Compare that to a "normal" heart rate of around 60 bpm. Now, after taking replacement hormone for my lack of a thyroid, my bpm has gone up to 45. Still not that much, and still not so-called "normal". But enough for me to start losing weight on my maintenance calories of 800 per day. Also, my body temperature is low. Before I got my diagnosis of Hashimoto's Thyroiditis (the medical term for no working thyroid) my body temperature was around 34.5 degrees C. I spent almost my entire life from the age of nine years in a state that is normally described as "severe hypothermia". Which is miserable and saw me feeling cold all the time, even in the middle of an Australian summer in the bush, where temperatures can quite easily rise to 46 degrees C.All genetics are only expressible in an environment. What's more, metabolic functions are pretty nuts and bolts stuff that don't usually have huge variances. So I'm not sure what you think is so biologically determined.
Calories in versus calories out isn't an argument. It is both an expression of one of most well observed science laws - thermodynamics, as well as a consistent observation of nutrition. You lock someone in a metabolic ward so you can truly measure all the output, and control all the dietary input, and even back into the 1800s, we don't see more than 4% disagreement between the two - smaller for any modern ones.
Thyroid conditions generally change how active someone is and perhaps a bit of their appetite. It doesn't change anything fundamental about if people can lose or gain weight.